农桐间作地热量平衡和水分利用状况研究

由实测资料系统分析了农桐间作地热量平衡各分量复杂的时空变化特征。结果表明：间作内外蒸发耗热（ＬＥ）仍是主要耗热项，湍流耗热（Ｈ）低于ＬＥ，但高于土壤热通量（Ｑ）；间作地各分量小于对照，但ＬＥ、Ｑ占净辐射（Ｒｎ）比值高于对照；泡桐林带对各分量的影响与间作结构及测点位置有关。然后计算了间作中小麦、棉花水分利用率（ＷＵＥ），其值与作物类型，生长期等因子有关，且间作地高于对照。

STUDY OF HEAT BALANCE AND WATER USE EFFICIENCY IN CROP AND PAULOWNIA INTERCROPPED FIELD

The spatial and temporal variations of all components of heat balance in a paulownia-crop field are examined in detail using actual measurements. Results show that in such a field anda control plot the latent heat flux(LE) remains predominant,sensible heat flux(H) is less thanLE but higher than Q_s(soil heat flux);all components inside such an intercropped field are small-er as compared to the control plot but LE and Q_s account for a higher proportion in net radiation(R_n);the tree belt has its effect on the components dependent on the intercropping structure andmeasuring site. Finally , water use efficiency(WUE) is computed of wheat and cotton in the in-tercropping and the value is found to depend on the variety and its growth duration and to belower in the control plot.